Show better error messages in network failures.

utils/pub/package.dart

Index: utils/pub/package.dart
diff --git a/utils/pub/package.dart b/utils/pub/package.dart
index 8d84546ec8f676209b7164ce815c5293b948ff88..d2940f0cd670eb723e1e9d4fc208785460999f81 100644
--- a/utils/pub/package.dart
+++ b/utils/pub/package.dart
@@ -137,7 +137,10 @@ class PackageId implements Comparable {
            other.version == version;
   }
 
-  String toString() => "$name $version from ${source.name}";
+  String toString() {
+    if (source.isDefault) return "$name $version";
+    return "$name $version from ${source.name}";

[nweiz, 2012/11/05 19:55:36]

While we're cleaning up toStrings, maybe add a default Source#toString that
returns the source's name, and use that here?

[Bob Nystrom, 2012/11/05 20:43:06]

Good idea. Done.

+  }
 
   int compareTo(Comparable other) {
     if (other is! PackageId) throw new ArgumentError(other);